Laminated board and process of making same.



M. LAGHMAN. LAMINATED BOARD AND PROCESS OF MAKING SAME. APPLIGATION FILED MAY 15, 1912.

1, 1 30,41 0. Patented Mar. 2, 1915.

UNITED STATES PATENT OFFICE.

MAURICE LaoHMaN, or NEW YORK, N. Y., Assieiipniro LAcr M N iaAnIIFAoTURIarG COMPANY, or NEW YORK, N. Y., A CORPORATION or DELAWARE.

Specification of Letters Iatefi t.

Patented Mar. 2', 1915.

Application filed may 15, 1912. Serial No. 097,437.

To all whom it may concern:

Be it known that I, MAURICE LAoHMAN, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Laminated Boards and Processes of Making Same, of which the following is a specification.

This invention relates to improvements in laminated board and more particularly has reference-to the production of boards or sheets one or both surfaces of which consists of a thin layer of steel or other metal, to which a backing of sound deadening material is united.

The invention is particularly useful in the construction of fireproof partitions, doors, furniture and. such like material, it being the present day practice, especially in tall buildings, to have all material which enters into the construction fireproof, as for instance metal doors and window frames as well as metal furniture, the latter class of articles coming more and more into great demand; I

It is the prevailing practice at present where two exposed surfaces are necessary as in door construction, to space two plates of metal apart with proper devices joining them and to fill in between the plates with a deadening material such as wood, asbestos, composition board etc. Sometimes an adhesive such as glue or cement is employed in the attempt to fasten the metal to the deadening material or backing. In other cases, the main space between the metal plates is left hollow. In all these constructions as heretofore made up a metallic sound or vibration is set up in the metal due to sounds striking the metal as well as when the article is struck or touched. A further obiection exists in that in order to prevent indentation of the metal surface and also to give the requisite strength and solidity, the metal employed is of comparatively heavy gage, adding greatly to the cost of material necessary. Thin metal it has been impossible to use owing to the liability to becoming dented and marred and the impossibility to heretofore successfully unite the metal, and keep it united, to the backing or filler by glue or cement, as the adhesives heretofore proposed will not stand the heat to which the metal is subjected when enameling or otherwise decorating the surface of the metal.

I find after a great amount of experimenting that by ta ing a sheet of very thin steel and applying to it under pressure and w1th a suitable adhesive a composition board, that the result is a very rigid structure wh1ch is absolutely dead to sound vibration and even though the metal surface be exceedingly thin it cannot become dented. It s absolutely necessary that the metal be solidly united to the composition backing so that no air pockets are formed between the two parts and that the whole is formed into a unitary structure, the metal becoming so much a part .of the backing that it cannot be separated therefrom. I find that this result can be attained by making the board as a laminated structure, the outer lamination 'oraveneer being of thin sheet steel to which is fastened .or united by a suitable adhes1ve and under. pressure a sheet of ugh piper. After these parts are secured further laminationsor layers of paper are added to the desired thickness according to the strength desired; By this construction the desired outer surface of steel is maintamed yet a board light in weight and dead to sound is attained.

The nature of the invention and the manner of carrying it into effect will be more clearly understood from the drawings and sub 0ined description.

In the drawings Figure 1 illustrates a cross-section through a board made up in accordance with this invention. Fig. 2 is a sumlar view of a board having a metal facmg on each side.

In producing the board or laminated sheet forming the subject of this invention, one surface of a very thin sheet of steel 1, is first chemically cleaned so as to remove all foreign matter and leave a clean metallic surface. Over this surface is spread an adhesive containing a mixture of silicate of soda and a resinous compound such as rosin preferably in equal parts and rendered plastic. The sheet of metal is then run through a set of pressure rolls, together with a sheet of paper 2 superimposed on the adhesive coated surface of the metal sheet. These superposed sheets are continued to be passed through rolls under pressure until the adhesive and the paper has become thoroughly dry and hard. After this operation has been completed additional layers of paper or straw board 3 are superposed on the sheet 2 and each firmly pressed and fastened to the preceding sheet by any suitable adhesive and in any suitable manner until a board of the desired thickness has been built up.

I find that by employing the adhesive above specified that it is absolutely impossible to separate the paper from the metal even after the metal has been subjected to the enormous heat necessary to properly grain and enamel it to imitate wood as is the present practice, thus obtaining a metal veneered paper board, the metal of which forms practically an integral part ofthe p p In Fig. 2 I show a board in which the metal veneer is applied to both sides of the paper backing made up of the laminated sheets 2, the one metal surface being represented at 1 while the other is indicated by the character 4.

What I claim as my invention is:

1. As anew article of manufacture, alaminatedboard comprising a thin sheet metal veneer, a laminated paper backing, and a cement including silicate of soda and rosin uniting said metal veneer and said backing to form an integral structure.

2. As an article of manufacture, a laminated board comprising a metallic member, a dense sound deadening member, and a binder between said members, said binder including silicate of soda and resin, all of the specified parts being united to form an integral board.

3. The process of constructing metal faced laminated boards consisting in coating a thin sheet of metal with a liquid comprising silicate of soda and rosin, then applying a sheet of paper to the coated surface, then passing said sheets between pressure rolls until the parts are dry and set, then applying a cement upon said paper, then superposing a second sheet of paper upon said cement and applying pressure until the cement is dry, then alternately applying cement and sheets of paperand applying pressure after the application of each sheet of paper until the parts become dry, to make up a board of the required thickness.

4. The process of constructing metal faced paper boards as follows; cleaning the'surface of a thin metal sheet, applying a binder comprising silicate of soda and rosin, superposing a sheet of paper upon said binder,

then applying pressure until the parts are dry, then applying cement to the paper, superposing a sheet of paper upon said cement, then again applying pressure until the cement is dr substantially as set forth.

Signed at ew York in the county of New York and State of New York this eight day of May A. D. 1912.

MAURICE LACI-LMAN. Witnesses:

F. B. TOWNSEND, Rnssnu. Boner. 

